10/5/2010 · Remember that if your boom truck is not set up level to within 1% (or as per manufacturer instructions) – your load chart does not apply! Be aware that in a 20 foot span, 1% is two inches off-level! Anything past this point and your crane can lose 15 – 20% or more of the rated capacity. If your outrigger pad is set down on an unleveled float, it may slide off under load and set off a